Forward (/vault->/data) mirroring was gated to only AREA/CATEGORY/ID-shaped
names, so arbitrary sub-structure Ryan creates inside an ID (e.g. dated trip
folders under F.21.21) never propagated to /data. Removed the name-shape
gate; the existing parent-must-exist check is sufficient safety, plus an
explicit '0 System area' exclusion since that tree has no /data root at all.
Hermes